Yesterday, I was pleased to pay $1.66 for mid-grade gasoline and I was wondering whether it would drop further or rise. But now I have an answer -- Israeli attacks in Gaza Strip are enriching the oil-producing countries that surround it. More specifically, oil prices have increased $3 a barrel to more than $40, while the price of gold is up 2% to $881.85 -- a 30% rise above its 13-month low two months ago.

Will the violence in the Middle East continue? If so, for how long? My guess is that Israel is planning a ground war which will last for several weeks -- the timing of the move takes advantage of the transition of power between Bush and Obama and posturing before January's Israeli election.

In the meantime, the key question for investors is whether they should buy energy stocks -- they will almost certainly rise today and will continue to go up as long as the possibility remains of escalation -- in the form of an military or economic attack, such as an oil embargo, on Israel and Western interests from other Middle Eastern countries. If there is an escalation, we could see a big spike in oil prices which would help energy investors.

But that could cause an even deeper economic slowdown which would cause oil prices to collapse even more once the violence ends.

Peter Cohan is President of Peter S. Cohan & Associates. He also teaches management at Babson College. His eighth book, You Can't Order Change: Lessons From Jim McNerney's Turnaround at Boeing, was published by Portfolio on December 26, 2008